Storm Prediction Center Mesoscale Discussion 2249

   Mesoscale Discussion 2249
   NWS Storm Prediction Center Norman OK
   0712 PM CST Tue Dec 02 2025

   Areas affected...coastal northern New England

   Concerning...Heavy snow 

   Valid 030112Z - 030715Z

   SUMMARY...Moderate to heavy snow rates on the order of 1/2 to 1+
   inches per hour are possible across southern Maine this evening,
   with heaviest rates most probable near Down East coastal areas
   closer to and after Midnight EST, as strengthening and gusty winds
   contribute to reduced visibilities and blowing/drifting.

   DISCUSSION...A deepening surface cyclone is forecast to continue an
   east-northeastward migration, generally south through east of the
   Cape Cod vicinity through mid to late evening.  This will be
   accompanied by a zone of strengthening lower/mid-tropospheric
   frontogenetic forcing to its north through northeast.  At
   mid-levels, the Rapid Refresh indicates that this will shift across
   southern Maine through southern New Brunswick, where forecast
   soundings indicate that  strengthening lift in (roughly) the 600-500
   mb layer may coincide with temperatures most conducive to large
   dendritic ice crystal growth (around -15 C).

   There is notable spread within and among the various model output
   concerning these details, and potentially varying rates of cyclone
   and upward vertical motion intensification.  However, in the
   presence of sub-freezing thermodynamic profiles, guidance generally
   indicates snow rates on the order of 1/2 to 1 inch per hour are
   possible this evening across much of southern Maine.  Heaviest rates
   appear most probable near immediate coastal areas of Maine,
   particularly across Down East coastal Maine closer to and after
   05-06Z, when strengthening and gusty east-northeasterly surface
   winds may contribute to considerable blowing/drifting and reduced
   visibilities.

   ..Kerr.. 12/03/2025

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...CAR...GYX...

   LAT...LON   43277133 44757076 45456714 44046610 43626951 43127081
               43277133